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Abstract

We demonstrate a whispering gallery optical parametric oscillator pumped at 488 nm wavelength. This millimeter-sized device has a pump threshold of 160 μW. The signal field is tunable between 707 and 865 nm wavelength and the idler field between 1120 and 1575 nm through temperature variation. Although the conversion efficiency is fundamentally limited to several percent because of absorption loss for the pump wave, the results provide evidence that such oscillators will be able to cover finally the entire visible range.

Figures (4)

Illustration of the experimental setup: Pp, Pp*, and Ps represent powers of the pump wave at 488 nm, of its transmitted portion, and of the signal light, respectively. The inset shows a microscope picture of the resonator, whereas the arrow indicates the direction of the crystallographic z-axis.

Signal power Ps versus total pump power Pp and versus the fraction Pp˜ available for the parametric process at 40 °C resonator temperature. The dots are the experimental data, and the solid line corresponds to a fit according to Eq. (3).

Signal and idler wavelengths versus the resonator temperature. The solid and dashed curves correspond to theoretically expected values under the assumption of different transversal mode combinations sketched in the inset for pump (p), signal (s), and idler (i) waves. The curved line in the inset indicates the resonator rim.